[lug] NIC Speed

[D. Stimits]

I did this just for fun, my 100 Mbit/sec switch LED's indicate full
duplex and 100 Mbit/sec. The machine with RH 7.1 beta and separate
Etherexpress Pro 100 indicates correctly negotiated 100baseTx-FD, link
ok. However, the RH 7.1 machine with integraged version of the same NIC
says 10 Mbit, half duplex, no link. I can talk back and forth between
the two machines just fine, so I don't know what the "no link" is about.
I'm wondering if maybe the integrated version of this card does not use
the MII interface? I noticed the -F force option has no effect as well
from the one end, and the switch definitely says it is full duplex and
100 Mbit/sec. Even so, there are times when I've wondered about the
speed, this makes me more curious. I also begin to wonder if there is
another way to actually benchmark or test NIC speed.

D. Stimits, stimits at idcomm.com

Tkil wrote:
> 
> >>>>> "Kyle" == Kyle Moore <kmoore at mooreimages.com> writes:
> 
> Kyle> How can I tell what speed my NIC is negotiating? [...]  Is there
> Kyle> a way to tell from the box what speed it is seeing.
> 
> most switches/hubs i've seen have some indication on them for
> different speeds.  many cards i've worked with have similar (that is,
> actual LEDs or other indicators showing link status).
> 
> to find this from software, look into the programs at:
> 
>    http://www.scyld.com/diag/
> 
> my redhat 7.2 box has "mii-tool" (part of net-tools) which seems to
> show the information you want:
> 
> | # rpm -qf `which mii-tool`
> | net-tools-1.60-3
> | # mii-tool
> | eth0: no autonegotiation, 10baseT-HD, link ok
> 
> this will only work if you have an MII PHY (?) interface -- but most
> 100Mbit cards use those, so...
> 
> t.
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